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shivering like a chihuahua 

to be utterly excited about something to the point of near uselessness.
Did you see how excited Bill was when he met Mary? He was shivering like a chihuahua!

Shakin' like a scared chihuahua 

Person 1: Hey dude, you're shaking a lot.

Person 2: Yeah, I'm shakin' like a scared chihuahua